.top-btn {
  background: #2154a5 none repeat scroll 0 0;
  border-radius: 3px;
  bottom: 70px;
  color: #fff;
  display: inline-block;
  font-size: 28px;
  height: 45px;
  opacity: 0;
  position: fixed;
  right: 20px;
  text-align: center;
  width: 70px;
  z-index: 10000;
  /*-webkit-transition: o"pacity .3s 0s, visibility 0s .3s;
  -moz-transition: opacity .3s 0s, visibility 0s .3s;
  transition: opacity .3s 0s, visibility 0s .3s;*/
  -webkit-transition: all 0.6s ease 0s;
  -moz-transition: all 0.6s ease 0s;
  -ms-transition: all 0.6s ease 0s;
  -o-transition: all 0.6s ease 0s;
  transition: all 0.6s ease 0s;
}
.top-btn .icon {
    display: table-cell;
    height: inherit;
    vertical-align: middle;
    width: inherit;
}
.top-btn.top-visible, .top-btn.top-fade-out, .no-touch .top-btn:hover {
  -webkit-transition: all 0.3s ease 0s;
  -moz-transition: all 0.3s ease 0s;
  -ms-transition: all 0.3s ease 0s;
  -o-transition: all 0.3s ease 0s;
  transition: all 0.3s ease 0s;  
  bottom: 20px;
}
.top-btn.top-visible {
  visibility: visible;
  opacity: 1;
}
/*.top-btn.top-fade-out {
  opacity: .5;
}*/